Cold isostatic pressure pretreatment of biochar to promote the adsorption performance of Hg(II) under the synergistic effect of carbon and nitrogen related sites

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-04-02 DOI:10.1016/j.colsurfa.2025.136820

Xin Qian , Zhenyu Wei , Peng Lv , Yu Qi , Jing Wang , Feng Zhen , Bin Qu

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Abstract

The biochar derived from lignin has nitrogen-rich functional groups and presents a wide range of potential applications in the treatment of wastewater. In order to prepare N-containing modified biochar (CNB), a novel cold isostatic pressing (CIP) pretreatment method is presented in this paper. This method breaks down the microstructure in the straw, allowing for complete pyrolysis of the material during the preparation process.The process by which CNB-300 absorbs or sequesters Hg(II) ions was very similar to the Langmuir model; its saturated adsorption capacity on Hg(II) was 160.65 mg/g at 25 °C. This technique significantly increases the nitrogen content in biochar to 15 %, enhances the specific area of contact of the biochar, and forms a complex pore structure, which allows more N-containing chemical bonds to be exposed and participate in the removal process. This promotes the combined impact of nitrogen-related sites and carbon on the removal of Hg(II).

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.